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  • Bug fixes for general core bugs in 2.8.x ended 9 November 2015 (12 months).
  • Bug fixes for security issues in 2.8.x ended 9 May 2016 (18 months).
  • minimum PHP 5.4.4 (always use latest PHP 5.4.x or 5.5.x on Windows - http://windows.php.net/download/), PHP 7 is NOT supported
  • /filter/tex/ -> pix.php (source)
       1  <?php
       2        // This function fetches math. images from the data directory
       3        // If not, it obtains the corresponding TeX expression from the cache_tex db table
       4        // and uses mimeTeX to create the image file
       5  
       6  // disable moodle specific debug messages and any errors in output
       7  define('NO_DEBUG_DISPLAY', true);
       8  define('NO_MOODLE_COOKIES', true); // Because it interferes with caching
       9  
      10      require_once('../../config.php');
      11  
      12      if (!filter_is_enabled('tex')) {
      13          print_error('filternotenabled');
      14      }
      15  
      16      require_once($CFG->libdir.'/filelib.php');
      17      require_once($CFG->dirroot.'/filter/tex/lib.php');
      18      require_once($CFG->dirroot.'/filter/tex/latex.php');
      19  
      20      $cmd    = '';               // Initialise these variables
      21      $status = '';
      22  
      23      $relativepath = get_file_argument();
      24  
      25      $args = explode('/', trim($relativepath, '/'));
      26  
      27      if (count($args) == 1) {
      28          $image    = $args[0];
      29          $pathname = $CFG->dataroot.'/filter/tex/'.$image;
      30      } else {
      31          print_error('invalidarguments', 'error');
      32      }
      33  
      34      if (!file_exists($pathname)) {
      35          $convertformat = get_config('filter_tex', 'convertformat');
      36          if (strpos($image, '.png')) {
      37              $convertformat = 'png';
      38          }
      39          $md5 = str_replace(".{$convertformat}", '', $image);
      40          if ($texcache = $DB->get_record('cache_filters', array('filter'=>'tex', 'md5key'=>$md5))) {
      41              if (!file_exists($CFG->dataroot.'/filter/tex')) {
      42                  make_upload_directory('filter/tex');
      43              }
      44  
      45              // try and render with latex first
      46              $latex = new latex();
      47              $density = get_config('filter_tex', 'density');
      48              $background = get_config('filter_tex', 'latexbackground');
      49              $texexp = $texcache->rawtext; // the entities are now decoded before inserting to DB
      50              $lateximage = $latex->render($texexp, $image, 12, $density, $background);
      51              if ($lateximage) {
      52                  copy($lateximage, $pathname);
      53                  $latex->clean_up($md5);
      54  
      55              } else {
      56                  // failing that, use mimetex
      57                  $texexp = $texcache->rawtext;
      58                  $texexp = str_replace('&lt;', '<', $texexp);
      59                  $texexp = str_replace('&gt;', '>', $texexp);
      60                  $texexp = preg_replace('!\r\n?!', ' ', $texexp);
      61                  $texexp = '\Large '.$texexp;
      62                  $cmd = filter_tex_get_cmd($pathname, $texexp);
      63                  system($cmd, $status);
      64              }
      65          }
      66      }
      67  
      68      if (file_exists($pathname)) {
      69          send_file($pathname, $image);
      70      } else {
      71          if (debugging()) {
      72              echo "The shell command<br />$cmd<br />returned status = $status<br />\n";
      73              echo "Image not found!<br />";
      74              echo "Please try the <a href=\"$CFG->wwwroot/filter/tex/texdebug.php\">debugging script</a>";
      75          } else {
      76              echo "Image not found!<br />";
      77              echo "Please try the <a href=\"$CFG->wwwroot/filter/tex/texdebug.php\">debugging script</a><br />";
      78              echo "Please turn on debug mode in site configuration to see more info here.";
      79          }
      80      }
    

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